Another thing premailer can do for you is to turn relative URLs (e.g."/some/page.html" into "http://www.peterbe.com/some/page.html"). Itdoes this to all `href` and `src` attributes that don't have a `://`part in it. For example, turning this::

Certain HTML attributes are also created on the HTML if the CSScontains any ones that are easily translated into HTML attributes. Forexample, if you have this CSS: `td { background-color:#eee; }` thenthis is transformed into `style="background-color:#eee"` AND as anHTML attribute `bgcolor="#eee"`.

Having these extra attributes basically as a "back up" for really shitemail clients that can't even take the style attributes. A lot ofprofessional HTML newsletters such as Amazon's use this.You can disable some attributes in `disable_basic_attributes`